基于FBO的GPU混合体绘制算法研究

Research on the Algorithm of Hybrid Volume Rendering with GPU Based on the FBO

体绘制是渲染三维数据场的重要技术,可以探索物体的内部结构,相对于面绘制和切片技术体绘制能够更加形象地展示物体的内部形态,描述非定形的物体。然而体绘制算法复杂度高,数据存储量大,计算时间较长,为了能解决体绘制渲染效率问题,论文介绍了基于GPU加速的光线投射算法实时体绘制技术,并在此基础上提出了基于FBO的快速混合体绘制算法,解决了体绘制图形与常规图元同屏绘制互相遮挡的问题,目前该方法已应用于三维地质解释综合成图系统中,实现了三维属性体与地层、断层曲面同屏显示,提高了解释工作的质量和效率。

Volume rendering is a kind of important technology of 3D data volume rendering, which can display the internal struc-tures and the shapes of the data cubes more vividly than the surface rendering and the technique for surface extraction from a vol-ume. However, volume rendering algorithm have the characteristics of complexity, high data storage capacity and longer calcula-tion, in order to solve the problem of volume rendering efficiency, the paper introduces the Ray-casting algorithm real-time volumerendering technology which is based on GPU acceleration, and puts forward a method of fast hybrid volume rendering based onFBO to solve the volume rendering graphics primitives to draw each other with conventional occlusion problems with the samescreen. At present, this method has been applied to the three-dimensional geological interpretation of comprehensive mapping sys-tem, which realizes that the three-dimensional attribute body and stratigraphy, fault surface can be shown at the same time, and im-proves the quality and efficiency of the interpretation work.